PAC07 - List of Authors (Mokhov, N. V.)

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Mokhov, N. V.

Paper	Title	Page
MOPAS027	Energy Deposition Studies of Block-Coil Quadrupoles for the LHC Luminosity Upgrade	491
	N. V. Mokhov, V. Kashikhin, M. Monville Fermilab, Batavia, Illinois P. Ferracin, G. L. Sabbi LBNL, Berkeley, California
	Funding: Work supported by the Director, Office of Science, U. S. Department of Energy under Contract DE-AC02-05CH11231. At the LHC upgrade luminosity of 10³⁵ cm^-2 s^-1, collision product power in excess of a kW is deposited in the inner triplet quadrupoles. The quadrupole field sweeps secondary particles from pp-collisions into the superconducting coils, concentrating the power deposition at the magnetic mid-planes. The local peak power density can substantially exceed the conductor quench limits and reduce component lifetime. Under these conditions, block-coil geometries may result in overall improved performance by removing the superconductor from the magnetic mid-planes and/or allowing increased shielding at such locations. First realistic energy deposition simulations are performed for an interaction region based on block-coil quadrupoles with parameters suitable for the LHC upgrade. Results are presented on 3-D distributions of power density and accumulated dose in the inner triplet components as well as on dynamic heat loads on the cryogenic system. Optimization studies are performed on configuration and parameters of the beam pipe, cold bore and cooling channels. The feasibility of the proposed design is discussed.
TUPAS011	Collimation System for the Fermilab Booster to Main Injector Transfer Line	1673
	B. C. Brown, D. Capista, I. Kourbanis, N. V. Mokhov, V. Sidorov Fermilab, Batavia, Illinois
	Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000. A collimation system has been created for removing proton beam halo in the 8 GeV transfer line from the Fermilab Booster to Main Injector. A pair of 1.14 meter collimators with 5.08 cm rectangular apertures are installed in a 5 meter straight section. Horizontal and vertical motion systems allow them to be positioned such that halo can be scraped from four sides. An additional pair of collimators, placed one cell (90 degrees) downstream scrape halo which is of opposite phase. Each collimator pair can scrape about 600 Watts of beam power, limited by long term activation of materials outside of the beam line tunnel. Personnel exposure is reduced by surrounding the iron absorber with a layer of marble. Design features,radiation calculations and instrumentation considerations will be described.
TUPAS016	Collimation System Design for Beam Loss Localization with Slipstacking Injection in the Fermilab Main Injector	1688
	A. I. Drozhdin, B. C. Brown, D. E. Johnson, I. Kourbanis, N. V. Mokhov, I. Rakhno, V. Sidorov Fermilab, Batavia, Illinois K. Koba KEK, Ibaraki
	Results of modeling with the STRUCT and MARS15 codes of beam loss localization and related radiation effects are presented for the slipstacking injection to the Fermilab Main Injector. Simulations of proton beam loss are done using multi-turn tracking with realistic accelerator apertures, nonlinear fields in the accelerator magnets and time function of the RF manipulations to explain the results of beam loss measurements. The collimation system consists of one primary and four secondary collimators. It intercepts a beam power of 1.6 kW at a total scraping rate of 5%, with a beam loss rate in the ring outside the collimation region of 1 W/m or less. Based on thorough energy deposition and radiation modeling, a corresponding collimator design was developed that satisfies all the radiation and engineering constraints.
THPMN089	Enhancement of Heat Removal using Concave Liquid Metal Targets for High-Power Accelerators	2915
	I. Konkashbaev, P. F. Fisher, A. Hassanein ANL, Argonne, Illinois N. V. Mokhov Fermilab, Batavia, Illinois
	The need is increasing for development of high power targets and beam dump areas for the production of intense beams of secondary particles (IFMIF, SNS, RIA, LHC). The severe constraints arising from a MW beam power deposited on targets and absorbers, call for non-trivial procedures to dilute the beam. This study describes the development of targets and absorbers and the advantages of using flowing liquid metal in concave channels first proposed by IFMIF to raise the liquid metal boiling point by increasing the pressure in liquid supported by a centrifugal force. Such flow with a back-wall is subject to the Taylor-Couette instability. The instability can play a positive role of increasing the heat transfer from the hottest region in the target/absorber to the back-wall cooled by water. At the laminar stage of the instability with a certain wave number of vortexes, the heat transfer from a chain of vortexes to the wall increases heat removal by enhancing the convective transport inside the liquid bulk and from the bulk to the wall. Results of theoretical analysis and numerical modeling of both targets and dump areas for the IFMIF, ILC, and RIA facilities are presented.
THPMN098	Modeling and Design of the ILC Test Area Beam Absorbers at Fermilab	2939
	M. Church, A. Z. Chen, N. V. Mokhov, S. Nagaitsev, N. Nakao Fermilab, Batavia, Illinois
	Detailed MARS15 simulations have been performed on energy deposition and shielding of the proposed ILC Test Area absorbers to deal with up to 50 kW of 800 MeV electron beam power and provide unlimited occupancy conditions in the hall. ANSYS analysis based on the calculated energy deposition maps confirms robustness of the proposed design of the absorbers and beam windows for normal operation and for various failure modes. A non-trivial shielding solution was found for the entire region housing the main and single-bunch absorbers.
THPMN100	Suppression of Muon Backgrounds Generated in the ILC Beam Delivery System	2945
	A. I. Drozhdin, N. V. Mokhov, N. Nakao, S. I. Striganov Fermilab, Batavia, Illinois L. Keller SLAC, Menlo Park, California
	Particle fluxes generated from the interactions of beam halo with the collimators in the ILC Beam Delivery System (BDS) can exceed tolerable levels for the collider detectors and create hostile radiation environment in the interaction region. Thorough analysis of the BDS model, beam loss patterns, driving geometry factors and physics processes along with verification of the simulation codes were performed for the current ILC BDS layout with 250-GeV electron and positron beams crossing at 14 mrad with a push-pull detector option. Muon flux reduction by distributed toroids (doughnut-type spoilers) in comparison with magnetic iron walls filling the BDS tunnel are calculated and analysed in great detail. Shielding conditions which allow occupancy of the interaction region while the full power beam is on the linac tuneup dump are also studied.
THPMN102	A Muon Beam for Cooling Experiments	2948
	A. Jansson, V. Balbekov, D. R. Broemmelsiek, M. Hu, N. V. Mokhov, K. Yonehara Fermilab, Batavia, Illinois
	Funding: Work supported by the US Department of Energy Within the framework of the Fermilab Muon Collider Task Force, the possibility of developing a dedicated muon test beam for cooling experiments has been investigated. Cooling experiments can be performed in a very low intensity muon beam by tracking single particles through the cooling device. With sufficient muon intensity and large enough cooling decrement, a cooling demonstration experiment may also be performed without resolving single particle trajectories, but rather by measuring the average size and position of the beam. This allows simpler, and thus cheaper, detectors and readout electronics to be used. This paper discusses muon production using 400MeV protons from the linac, decay channel and beamline design, as well as the instrumentation required for such an experiment, in particular as applied to testing the Helical Cooling Channel (HCC) proposed by Muons Inc.
MOPAS094	A High-Power Target Experiment at the CERN PS	646
	H. G. Kirk BNL, Upton, Long Island, New York J. R.J. Bennett STFC/RAL/ASTeC, Chilton, Didcot, Oxon O. Caretta, P. Loveridge STFC/RAL, Chilton, Didcot, Oxon A. J. Carroll, V. B. Graves, P. T. Spampinato ORNL, Oak Ridge, Tennessee I. Efthymiopoulos, A. Fabich, F. Haug, J. Lettry, M. Palm CERN, Geneva K. T. McDonald PU, Princeton, New Jersey N. V. Mokhov, S. I. Striganov Fermilab, Batavia, Illinois
	We test a target concept of a free-flowing mercury stream embedded in a high-field solenoid. The goal is to demonstrate the copious production of secondary pions and tertiary muons in a megawatt class proton beam at the front end of a neutrino factory or muon collider. Key components are described and results of the experimental commissioning phase are given.
WEOCAB01	Design of the Beam Delivery System for the International Linear Collider	1985
	A. Seryi, J. A. Amann, R. Arnold, F. Asiri, K. L.F. Bane, P. Bellomo, E. Doyle, A. F. Fasso, L. Keller, J. Kim, K. Ko, Z. Li, T. W. Markiewicz, T. V.M. Maruyama, K. C. Moffeit, S. Molloy, Y. Nosochkov, N. Phinney, T. O. Raubenheimer, S. Seletskiy, S. Smith, C. M. Spencer, P. Tenenbaum, D. R. Walz, G. R. White, M. Woodley, M. Woods, L. Xiao SLAC, Menlo Park, California I. V. Agapov, G. A. Blair, S. T. Boogert, J. Carter Royal Holloway, University of London, Surrey M. Alabau, P. Bambade, J. Brossard, O. Dadoun LAL, Orsay M. Anerella, A. K. Jain, A. Marone, B. Parker BNL, Upton, Long Island, New York D. A.-K. Angal-Kalinin, C. D. Beard, J.-L. Fernandez-Hernando, P. Goudket, F. Jackson, J. K. Jones, A. Kalinin, P. A. McIntosh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire R. Appleby UMAN, Manchester J. L. Baldy, D. Schulte CERN, Geneva L. Bellantoni, A. I. Drozhdin, V. S. Kashikhin, V. Kuchler, T. Lackowski, N. V. Mokhov, N. Nakao, T. Peterson, M. C. Ross, S. I. Striganov, J. C. Tompkins, M. Wendt, X. Yang Fermilab, Batavia, Illinois K. Buesser DESY, Hamburg P. Burrows, G. B. Christian, C. I. Clarke, A. F. Hartin OXFORDphysics, Oxford, Oxon G. Burt, A. C. Dexter Cockcroft Institute, Warrington, Cheshire J. Carwardine, C. W. Saunders ANL, Argonne, Illinois B. Constance, H. Dabiri Khah, C. Perry, C. Swinson JAI, Oxford O. Delferriere, O. Napoly, J. Payet, D. Uriot CEA, Gif-sur-Yvette C. J. Densham, R. J.S. Greenhalgh STFC/RAL, Chilton, Didcot, Oxon A. Enomoto, S. Kuroda, T. Okugi, T. Sanami, Y. Suetsugu, T. Tauchi KEK, Ibaraki A. Ferrari UU/ISV, Uppsala J. Gronberg LLNL, Livermore, California Y. Iwashita Kyoto ICR, Uji, Kyoto W. Lohmann DESY Zeuthen, Zeuthen L. Ma STFC/DL, Daresbury, Warrington, Cheshire T. M. Mattison UBC, Vancouver, B. C. T. S. Sanuki University of Tokyo, Tokyo V. I. Telnov BINP SB RAS, Novosibirsk E. T. Torrence University of Oregon, Eugene, Oregon D. Warner Colorado University at Boulder, Boulder, Colorado N. K. Watson Birmingham University, Birmingham H. Y. Yamamoto Tohoku University, Sendai
	The beam delivery system for the linear collider focuses beams to nanometer sizes at the interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the physics goals. The beam delivery system of the International Linear Collider has undergone several configuration changes recently. This paper describes the design details and status of the baseline configuration considered for the reference design.
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